Which claim is a factual statement rather than an opinion?

Which of the following are details about the compromise of 1877? election results in a couple of states were in dispute and too close to call. samuel tilden would be given the win in exchange for the removal of federal troops. the presidential election was close between rutherford hayes and ulysses grant. it was agreed troops would leave the south in exchange for a hayes victory.

What was the overall impact of eli whitneys introduction of interchangeable parts?

What was alexander hamilton‘s plan to speed up industrialization in the united states